The fact that, under harmonic analysis and contrary to the expectations of many musicians, the output of the original vibrato unit does contain other frequencies near that of the note frequencies and in place of the note frequencies.

In terms of musical note frequency, the averaging of the frequency of low or high notes in a solo instrumental piece is a technique used to match different instruments together so they may be played together.

Graha bhedam is the step taken in keeping the relative note frequencies same, while shifting the shadjam to the next note in the rāgam.

The easiest intervals to identify and tune are those where the note frequencies have a simple whole-number ratio (e.g. octave with a 1:2 ratio, perfect fifth with 2:3, etc.) because the harmonics of these intervals coincide and beat when they are out of tune.

This variant of the chip adds a number of major enhancements, such as separate envelopes for the three channels (as opposed to one shared envelope), variable duty-cycles, more bits of precision for note frequency, volume, and envelope frequency, and a much more configurable noise generator.

Graha bhedam is the step taken in keeping the relative note frequencies same, while shifting the Sruti (or drone) to another note in the rāgam.